If you dont already have the KAV extended bases, then it is unlikely you can load it into AVK.

You may try manually downloading the ext bases and putting them into your GDATA folder with the other KAV bases, but this is unsupported and may not work. In fact, it may even corrupt your GDATA installation.

GDATA AVK 2005 does have some sort of riskware protection I think, may be from KAV or BitDefender. Both have good detection, so you do not need to worry.